In this study, our aim was to determine the common sources of origin of 18 elements in the livers of Common Buzzards collected during the breeding season in an extensive agricultural landscape in south-east Poland with respect to age (adults and immatures) and sex (males and females). In all 34 specimens collected, the element concentrations followed the pattern of S > Na > Fe > Mg > Zn > Si > ...

BioOne (www.bioone.org) is a a nonprofit, online aggregation of core research in the biological, ecological, and environmental sciences. BioOne provides a sustainable online platform for over 170 journals and books published by nonprofit societies, associations, museums, institutions, and presses. Usage of BioOne content is strictly limited to personal, educational, and non-commercial use. Comm...

National survey on density, number and habitat use of Common Buzzards wintering in the lowlands (under 650 m a.s.l.) of Bulgaria was conducted in January 2006. Combined method of road count survey with point count technique modified by Distance analysis was applied. A total of 174 point transects were made and 501 Common Buzzards were registered. The frequency of species was 74.7% and the relat...

Predators can modify their diet and demography in response to changes food availability habitat quality. I tested the prediction that some species change predation pattern, between specialist type generalist type, depending on complexity of structure. It was hypothesized dietary is stronger diversified habitats than simplified ones, but opposite tendency occurs case reproductive response. The n...